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@article{AL_1988_27_4_a4, author = {M. V. Sapir}, title = {Algorithmic problems in varieties of semigroups}, journal = {Algebra i logika}, pages = {440--463}, publisher = {mathdoc}, volume = {27}, number = {4}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1988_27_4_a4/} }
M. V. Sapir. Algorithmic problems in varieties of semigroups. Algebra i logika, Tome 27 (1988) no. 4, pp. 440-463. http://geodesic.mathdoc.fr/item/AL_1988_27_4_a4/